Reading double value from console with Scanner

  
/*
 This program is a part of the companion code for Core Java 8th ed.
 (http://horstmann.com/corejava)

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Scanner;

/**
 * This program demonstrates a <code>while</code> loop.
 * 
 * @version 1.20 2004-02-10
 * @author Cay Horstmann
 */
public class Retirement {
  public static void main(String[] args) {
    // read inputs
    Scanner in = new Scanner(System.in);

    System.out.print("How much money do you need to retire? ");
    double goal = in.nextDouble();

    System.out.print("How much money will you contribute every year? ");
    double payment = in.nextDouble();

    System.out.print("Interest rate in %: ");
    double interestRate = in.nextDouble();

    double balance = 0;
    int years = 0;

    // update account balance while goal isn't reached
    while (balance < goal) {
      // add this year's payment and interest
      balance += payment;
      double interest = balance * interestRate / 100;
      balance += interest;
      years++;
    }

    System.out.println("You can retire in " + years + " years.");
  }
}

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Reading double value from console with Scanner : Scanner « Development Class « Java

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